You\'re tired of physics teachers telling you that air resistance is too hard to

Question

You're tired of physics teachers telling you that air resistance is too hard to analyze! After all, our world has an atmosphere and if you want to plan out the best way to lob a water balloon at your friend, you're going to have to figure out how to include air resistance. You decide to do an experiment to develop a better understanding of air resistance. You build a spring-loaded catapult that will release a water balloon from essentially ground-level once the spring is fully compressed. You set up a digital video camera so that you can analyze the balloon's trajectory later on a computer. You prepare the balloons so that they all have a mass of 2.5 kg. You shoot several balloons straight up and go home to analyze the video. During a typical trial, the balloon is launched with an initial speed of 20.0 m/s. The balloon reaches a maximum altitude of 13.2 meters. Just before the balloon hits the ground, your video tracking software estimates a final speed of 13.4 m/s. more than one answer is possible.

A) The balloon's initial kinetic energy mainly comes from the potential energy stored in the catapult's spring.
B) You transfer all of your source energy into the catapult spring's potential energy when you get it ready to launch the balloon.
C) Your thermal energy is constant when you wind up the catapult to get it ready to launch the balloon.
D) The balloon's rise and fall through the air is a reversible process.

Explanation / Answer

according tio law of conservation of energy

A) The balloon's initial kinetic energy mainly comes from the potential energy stored in the catapult's spring.

and also energy is transfered from one form to another form

B) You transfer all of your source energy into the catapult spring's potential energy when you get it ready to launch the balloon.

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